WORM_AUTORUN.CHO
Win/Tanglinko.A worm (NOD32), Worm/Tanglinko.B (Antivir), Trojan:Win16/Hasaruga.A (Microsoft)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
4,729,088 bytes
EXE
Yes
08 Aug 2013
Arrival Details
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This worm drops the following copies of itself into the affected system:
- %Windows%\SYSTIM32.EXE
- %System%\SYSTIM32.EXE
- %Windows%\TEMP.000
(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
It creates the following folders:
- {malware path}\SYSTIM32
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Expl0rer = "Systim32.exe"
Other System Modifications
This worm adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "1"
Dropping Routine
This worm drops the following files:
- %System Root%\regs.sys
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
NOTES:
It drops copies of itself in the malware path folder. These dropped copies use the names of the folders located on the said folder for their file names.